Aconical tent of the given volume has to be constructed find the ratio of the height to the radius of the base so as to minimize the canvas required for the tent

Jane is cooking beans and rice for dinner tonight. she has 4 cans of black beans, 6 cans of red beans, and 3 cans of garbanzo beans in her cupboard. if she grabs a can of beans without looking at the label, what is the probability of her making black beans and rice for dinner?